Suwabe K, Tsukazaki H, Iketani H, Hatakeyama K, Fujimura M, Nunome T, Fukuoka H, Matsumoto S, Hirai M
National Institute of Vegetable and Tea Science (NIVTS), 360 Kusawa, Ano, Age, Mie 514-2392, Japan.
Theor Appl Genet. 2003 Oct;107(6):997-1002. doi: 10.1007/s00122-003-1309-x. Epub 2003 Sep 3.
In an analysis of 114 F(2) individuals from a cross between clubroot-resistant and susceptible lines of Brassica rapa L., 'G004' and 'Hakusai Chukanbohon Nou 7' (A9709), respectively, we identified two loci, Crr1 and Crr2, for clubroot (caused by Plasmodiophora brassicae Woronin) resistance. Each locus segregated independently among the F(2) population, indicating that the loci reside on a different region of chromosomes or on different chromosomes. Genetic analysis showed that each locus had little effect on clubroot resistance by itself, indicating that these two loci are complementary for clubroot resistance. The resistance to clubroot was much stronger when both loci were homozygous for resistant alleles than when they were heterozygous. These results indicate that clubroot resistance in B. rapa is under oligogenic control and at least two loci are necessary for resistance.
在对来自抗根肿病和感根肿病的芜菁（Brassica rapa L.）品系‘G004’和‘Hakusai Chukanbohon Nou 7’（A9709）杂交产生的114个F(2)个体进行的分析中，我们鉴定出了两个抗根肿病（由芸苔根肿菌Woronin引起）的位点，即Crr1和Crr2。每个位点在F(2)群体中独立分离，这表明这些位点位于染色体的不同区域或不同染色体上。遗传分析表明，每个位点本身对根肿病抗性的影响很小，这表明这两个位点对根肿病抗性具有互补作用。当两个位点均为抗性等位基因纯合时，对根肿病的抗性比杂合时要强得多。这些结果表明，芜菁的根肿病抗性受寡基因控制，且至少需要两个位点才能产生抗性。
